Drug screening device (IMAGE) Optica Caption The new GRIN-based endoscope is being used with an implantable microdevice designed to quickly evaluate the effectiveness of various cancer therapies. Credit Guigen Liu, Harvard Medical School and Brigham and Women’s Hospital Usage Restrictions None License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.